Yes this is due to your Rhino SR7 version, the installer we use is only working from SR14 onwards, but there is an easy way to overcome this: rename the installerfile with ending .zip, then unzip it. inside the folder you will find the a file .rhp (rhino plugin). Install this one by just drag+drop it into rhino.

Although, i think you need to update Rhino to minimum SR12 to make the plugin work anyway…